What is Denial of Service DoS Attack in Computer Network?

What is Denial of Service DoS Attack in Computer Network? – As can be understood from the name Denial of Service (DoS), DoS attack is to disrupt the running system.

What is Denial of Service DoS Attack in Computer Network?

What is Denial of Service DoS Attack in Computer Network?

A DoS attack is an attack designed to prevent a server or a service from getting a valid service status. A DoS attack on a server is intended to exhaust the server by consuming all its resources.

The DoS attacker sends out a data packet that will consume server resources. Since the processing of the incoming data packet to the server will take a long time, the server resource usage will increase and therefore the user will not be able to answer the connection.

In short, a DoS attack is an attempt to put an institution or company’s website, email servers, and even phone systems into a state of inoperability. In this way, a company that can not provide services will deliver new customers to competitor firms.

Dos attacks are usually done over the Internet. These attacks on the internet can not serve the server by consuming the bandwidth.

DoS attack is done by only one system and it is easy to prevent DoS attacks.

Who Makes DoS Attacks?

These attacks are often carried out by Hacker groups, states, commercial companies and casual users. Even users with basic computer knowledge can easily attack by downloading DoS attack programs on the Internet.

DoS Attack Varieties

If we talk about DoS attack types, DoS attack types are as follows.

1. ICMP Flood Attack

In the ICMP Flood attack type, the network is made incompatible by sending counterfeit packets to all computers on the target network. This type of attack is also known as Smurf Attack and Ping of Death.

2. SYN Flood Attack

In the SYN flood attack, the attacker sends a packet to connect to the server, and in this type of attack TCP Handshake never completes. All open ports on the server continue to scan. As a result, ports that are busy on the server can not respond to new connection requests.

Today’s operating systems are designed with this attack in mind. If you are using an older operating system, you may need to upgrade to a newer operating system.

3. Buffer Overflow Attack

Buffer Overflow Attack is the most common type of DoS attack. In Buffer Overflow attack type, more fake packets are sent to a network address.

4. Smurf Attack

In the Smurf Attack type, the victim computer is used to attack the target computer by simulating the IP address of the victim computer. The attacker sends too many ICMP Ping broadcast traffic to the target computer, and therefore the attacking computer is brought to an unresponsive state.

This attack is easy to prevent and you can turn off your ping requests on your router. Today’s operating systems are constantly updated, so they will not be affected by this type of attack.

5. Fraggle Attack

The Fraggle Attack type is also similar to the Smurf Attack. Fraggle Attack uses UDP port. To prevent this type of attack, it is recommended that you close Echo ports 7 and 19 on the firewall.

6. Ping of Death Attack

When a packet larger than the maximum size of 65,535 bytes of a packet in the Ping of Death attack type is sent, the target operating system may crash. Current operating systems used today are not affected by this attack type. If you are using legacy operating systems on older computers, you can update these operating systems.

Free DoS Attack Programs

There are a lot of free DoS attack programs on the Internet. You can easily find these programs, but you can face severe legal penalties when you attack.

To test these types of programs, you can do experiments in a virtual network environment without an Internet connection. Otherwise, we recommend you do not to test the websites on the Internet for the attack.